While it's of course no surprise that Takatora didn't tell him about the Driver, it was also obvious that Mitsuzane knew before I told him. He's a good actor, but he's not that good.

The question is, how did he find out?

"Well, you understand, it started out as a defensive measure. But I have to admit your brother has taken to using it offensively at times as well." I pause, as if considering. "Though it is proving to be a difficult project. Perhaps offensive measures are precisely the answer, right?"